language: node_js
sudo: false
os:
  - linux
addons:
  apt:
    sources:
      - "ubuntu-toolchain-r-test"
    packages:
      - "g++-4.8"
install:
  - export CXX=g++-4.8
  - $CXX --version
  - npm install
node_js:
  - "12"
  - "10"
  - "8"
  - "6"